SSH is broken on downstream

From !1601 (closed): When I try to log in, I get client_loop: send disconnect: Broken pipe dmesg on device mentions signal 31 which is similar to https://github.com/openssl/openssl/issues/9984 Both openSSH and dropbear are broken in this way. Occurs on 3.10 kernel, Finepower F1 and Samsung Galaxy J1 Mini

added category::device type::bug labels

Thanks for reporting this, @HenriDellal!

I can reproduce this on lg-mako. I've built it against stable as workaround (copy all the pmaports from master branch to v20.05, then build it), and there the bug does not happen. So it's probably a recent change in Alpine's aports.git? (Does somebody want to look into it?)

With i9100 I don't get this, even with a fresh build from master.

By Oliver Smith on 2020-09-28T10:35:09

added help wanted label

CONFIG_SECCOMP=n fixed it for me so it's definitely something like @z3ntu's issue: https://github.com/openssl/openssl/issues/9984 (seccomp is useful+important for security so please only see that as a workaround, not the fix!)

Someone will need to figure out which syscall is getting blocked (there are probably ways to debug seccomp, not sure), then it might just need to be whitelisted or something like that.

By Minecrell on 2020-10-04T21:26:15

Doesn't seem to happen with a relatively minimally configured 3.4.113 kernel - even with CONFIG_SECCOMP=y

$ ssh -p 2222 user@localhost
Welcome to postmarketOS!

This distribution is based on Alpine Linux.
Read both our wikis to find a large amount of how-to guides and
general information about administrating and development.
See <https://wiki.postmarketos.org> and <https://wiki.alpinelinux.org>.

You may change this message by editing /etc/motd.

qemu-amd64:~$ uname -a
Linux qemu-amd64 3.4.113 #1-postmarketOS SMP Mon Oct 5 12:39:01 UTC 2020 x86_64 GNU/Linux

By Luca Weiss on 2020-10-05T13:05:42

Also works on fairphone-fp2 with a fresh build from just now:

$ ssh pmos
Warning: Permanently added '172.16.42.1' (ECDSA) to the list of known hosts.
Welcome to postmarketOS!

This distribution is based on Alpine Linux.
Read both our wikis to find a large amount of how-to guides and
general information about administrating and development.
See <https://wiki.postmarketos.org> and <https://wiki.alpinelinux.org>.

You may change this message by editing /etc/motd.

fairphone-fp2:~$ uname -a
Linux fairphone-fp2 3.4.0-perf #11-postmarketOS SMP PREEMPT Wed Jul 22 22:11:41 UTC 2020 armv7l GNU/Linux

By Luca Weiss on 2020-10-06T13:09:07

This did not happen on motorola-montana with 3.18 kernel, so my guess is that is happens only on 3.10 kernels, which is quite weird...

By Dolphin von Chips on 2020-10-13T12:17:32

mentioned in issue #854 (closed)

By Alexey Min on 2020-11-03T20:03:51

I could reproduce this on htc-memul with the fix being: https://github.com/openssh/openssh-portable/pull/213 I'll wait to see what upstream says to this - I'm not sure this is 100% the correct solution.

By Luca Weiss on 2020-11-08T14:42:08

mentioned in commit f3ecc8d3

By Alexey Min on 2020-11-21T00:40:13

mentioned in merge request !1746 (closed)

By Alexey Min on 2020-11-21T00:52:05

mentioned in commit b4333748

By Alexey Min on 2020-11-21T13:36:52

mentioned in commit 8bc2cacd

By Alexey Min on 2020-11-23T10:58:54

I have the same issue on my Samsung Galaxy J3.

By Michel Le Bihan on 2020-11-30T13:51:35

So, https://github.com/openssh/openssh-portable/pull/213 was merged.. so we wait for next release I guess?

By Alexey Min on 2021-02-05T10:11:49

https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/17897

By Luca Weiss on 2021-02-05T17:41:24

This has been merged in Alpine, can people with this problem please upgrade and recheck?

By Luca Weiss on 2021-02-06T20:57:47